They cut anyone with a rating below X where X is determined market by market in order to balance out the number of new drivers they have coming in with the number of drivers they are cutting for bad ratings and also taking into account growth for demand in the market. In new or rapidly growing markets they hardly cut anyone ever but in mature markets with ample supplies of drivers they demand a very high average rating. At one point the cut off for being let go in LA for example was something like 4.6 out of 5.
It appears only the desperate drivers are left in the system, making ranking and yanking self-defeating unless Uber wants to continue to canabilize its diminishing capacity.
